Arrangement of optical fiber segments for minimizing effect of nonlinearities
DCFirst Claim
1. A wavelength-division-multiplexing (WDM) system including:
- a first multiplexer, operatively interconnecting a plurality of digital information channels onto a transmission path;
a transmission path including an optical fiber span whose length (L) exceeds 10 kilometers and whose zero dispersion wavelength (λ
0) is about 1310 nm, CHARACTERIZED IN THAT the optical fiber has a loss at 1385 nm, which is less than its loss at 1310 nm, and a chromatic dispersion of between 1.5 and 8.0 ps/nm-km in the 1.4 μ
m wavelength region; and
wherein the first multiplexer provides at least three channels of WDM signals in the 1.4 μ
m wavelength region onto the transmission path.
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Abstract
A high-capacity optical fiber network [100, 200] includes wavelength-division multiplexing (WDM) within the 1.4 micron (μm) wavelength region (i.e., 1335-1435 nm). Such a system includes optical fiber [130] whose peak loss in the 1.4 μm region is less than its loss at 1310 nm. The optical fiber has a zero dispersion wavelength (λ0) at about 1310 nm, and linear dispersion between about 1.5 and 8.0 ps/nm-km within the 1.4 μm region. At least three WDM channels operate at 10 Gb/s in the 1.4 μm wavelength region and have a channel separation of 100 GHz. In one illustrative embodiment of the invention, a broadcast television channel, having amplitude modulated vestigial sideband modulation, simultaneously operates in the 1.3 μm region (i.e., 1285-1335 nm) and/or the 1.55 μm region (i.e., 1500-1600 nm). In another embodiment of the invention, 16 digital data channels are multiplexed together in the 1.55 μm region, each channel operating at about 2.5 Gb/s. Raman amplifiers [103, 113] are used for amplification in the 1.3 μm and the 1.4 μm wavelength regions, whereas an Erbium amplifier [123] is used for amplification in the 1.55 μm wavelength region.
79 Citations
28 Claims
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1. A wavelength-division-multiplexing (WDM) system including:
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a first multiplexer, operatively interconnecting a plurality of digital information channels onto a transmission path;
a transmission path including an optical fiber span whose length (L) exceeds 10 kilometers and whose zero dispersion wavelength (λ
0) is about 1310 nm,CHARACTERIZED IN THAT the optical fiber has a loss at 1385 nm, which is less than its loss at 1310 nm, and a chromatic dispersion of between 1.5 and 8.0 ps/nm-km in the 1.4 μ
m wavelength region; and
wherein the first multiplexer provides at least three channels of WDM signals in the 1.4 μ
m wavelength region onto the transmission path.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wavelength-division-multiplexing (WDM) system including:
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a first demultiplexer for interconnecting an optical transmission path having a plurality of digital information channels to a plurality of receivers;
a transmission path, including an optical fiber span whose length (L) exceeds 10 kilometers and whose zero dispersion wavelength (λ
0) is about 1310 nm,CHARACTERIZED IN THAT the optical fiber has a loss at 1385 nm, which is less than its loss at 1310 nm, and a chromatic dispersion of between 1.5 and 8.0 ps/nm-km in the 1.4 μ
m wavelength region, andwherein the first demultiplexer receives at least three channels of multiplexed optical signals in the 1.4 μ
m wavelength region from the transmission path.- View Dependent Claims (17, 18, 19, 20)
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21. Wavelength-division multiplexed optical waveguide system including:
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a first transmitter for generating, modulating, and multiplexing modulated channel carriers for introduction onto a transmission line, the first transmitter being characterized by an “
average system wavelength”
within the 1.4 μ
m wavelength region;
a first receiver for performing functions including demultiplexing modulated channel carriers;
a transmission line of optical fiber including at least one fiber span defined at one end by a transmitter and at the other end by a receiver, in which the optical fiber has a zero dispersion wavelength (λ
0) at about 1310 nmCHARACTERIZED IN THAT substantially all fiber defining the span has a chromatic dispersion of between 1.5 and 8.0 ps/nm-km at the average system wavelength; and
substantially all fiber defining the span has a transmission loss at 1385 nm that is less than its transmission loss at 1310 nm. - View Dependent Claims (22, 23, 24, 25, 26, 27)
a second transmitter for generating, modulating, and multiplexing modulated channel carriers for introduction onto a transmission line, the second transmitter providing a plurality of multiplexed data channels in the 1.55 μ
m wavelength region; and
a second receiver for performing functions including demultiplexing modulated channel carriers in the 1.55 μ
m wavelength region.
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28. Wavelength-division multiplexed optical waveguide system including:
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apparatus for transmitting and receiving a plurality of digital information channels, each channel operating at a different wavelength within the 1.4 μ
m region at a 10 Gb/s rate;
apparatus for transmitting and receiving a plurality of digital information channels, each channel operating at a different wavelength within the 1.55 μ
m region at a 2.5 Gb/s rate;
a transmission line comprising a length (L) of optical fiber extending between the transmitting and receiving apparatuses without dispersion compensation, wherein the length (L) is between 10 kilometers and 200 kilometers; and
wherein the optical fiber is characterized by (i) a zero-dispersion wavelength at about 1310 nm, (ii) a dispersion that is less than about 8.0 ps/nm-km for all channels in the 1.4 μ
m region, and (iii) a transmission loss at 1385 nm that is less than its transmission loss at 1310 nm.
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Specification